1. Trigonal tongue cover, generous sculpt, easy to open.

2. The utility model provides a trigonal pencil which consists of a pencil core and a pencil body, and is characterized in that the trigonal pencil body is arranged on the periphery of the pencil core.

3. The structure shows a distorted trigonal bipyramidal configuration with five - coordinations to a central tin atom.

4. The trigonal prism yields three isomers also, but there are only two octahedral arrangements FOR this FORmulation.

5. A trigonal bipyramid has three equatorial and two axial positions.

6. A ANSYS microsoft is used to found the mechanical model of the trigonal, roundish and square hollow PET fibers.

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7. This reflects the change of the crystal-habit of the trigonal trapezohedron simple form in synthetic smoky quartz.

8. Iterative formulae and vector product method for the evaluation of the inverse of a symmetrical trigonal matrix have been developed.

9. Complex 5,8 and 9 belong to non - centrosymmetric trigonal space group P 3 _ 121.

10. Both endo-cyclic and exo-cyclic tin atoms are five-coordinated and have coordination geometry of distorted trigonal bipyramid.

11. The tin atoms are five-coordinated with geometry of distorted trigonal bipyramid.

12. A new calculating method has been proposed for the elongation and twist of trigonal prism.